managed type or function cannot be used in unmanaged function

[querry]

Hi all,
I have someting like this...

xyz.h

#using   <mscorlib.dll>
#include <vcclr.h>
 
using namespace std;
 
using namespace System;
using namespace System::Data;
using namespace System::Data::OleDb;
using namespace System::Data::SqlClient;
using namespace System::Runtime::InteropServices;
 
#pragma unmanaged
 
class xyz
{
  public:
      string str1;
      gcroot<SqlConnection^> sqlConn;
      void someFun();
};

xyz.cpp

#include "xyz.h"
 
void xyz::someFun()
{
   sqlConn = new SqlConnection();
}
 

Which gives me the error C3821: Managed type or functions cannot be used in unmanaged functions what is the work around for this.

Thanks.